Parallels -- 8GB or 16GB of Ram

Hi,
I am getting a new macbook pro which I will use for personal purposes and work.  In my current computer, I have Windows installed with Bootcamp.  The heaviest lifting I do is in excel where I work in very large excel models, sometimes several at the same time.
I am purchasing a new baseline MBP 15" and with the faster computer I am hoping to run parallels so I don't have to restart every time I want to switch OS.  Would you recommend gettig 8GB of ram or 16GB of ram?
Thanks so much for your help!

bdstein33 wrote:
Hi,
 ...I am purchasing a new baseline MBP 15" and with the faster computer I am hoping to run parallels so I don't have to restart every time I want to switch OS.  Would you recommend gettig 8GB of ram or 16GB of ram? 
Thanks so much for your help!
The thing to keep in mind is that with Bootcamp, Windows got to use all the resources of your Mac; it didn't have to compete with the Mac OS for CPU cycles and RAM since Windows was all that was running. With Parallels (or other software that supports virtual machines, such as VMware Fusion), Windows is running inside of the Mac OS, which in your case would be Mavericks. Both operating systems are using resources such as RAM, as is the virtualizing software, and you have to make sure there's enough to go around.
So, the short answer is get as much RAM as you can, since, with the rMBP you can't add more later.

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    bdstein33 wrote:
    Hi,
     ...I am purchasing a new baseline MBP 15" and with the faster computer I am hoping to run parallels so I don't have to restart every time I want to switch OS.  Would you recommend gettig 8GB of ram or 16GB of ram? 
    Thanks so much for your help!
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